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AUSCERT External Security Bulletin Redistribution
ESB-2009.1381.2
AIX rpc.cmsd remote buffer overflow vulnerability
16 October 2009
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: rpc.cmsd
Calendar daemon library (libcsa.a)
Publisher: IBM
Operating System: AIX
Impact/Access: Root Compromise -- Remote/Unauthenticated
Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2009-3699
Original Bulletin:
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=18&ID=4803&myns=paix53&mync=E
Revision History: October 16 2009: Added CVE reference
October 8 2009: Initial Release
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IBM SECURITY ADVISORY
First Issued: Wed Oct 7 10:25:46 CDT 2009
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/cmsd_advisory.asc
or
ftp://aix.software.ibm.com/aix/efixes/security/cmsd_advisory.asc
VULNERABILITY SUMMARY
VULNERABILITY: AIX rpc.cmsd remote buffer overflow vulnerability
PLATFORMS: AIX 5.3, 6.1, and earlier releases
VIOS 1.4, 1.5, 2.1, and earlier releases
SOLUTION: Apply the fix or workaround as described below.
THREAT: A remote attacker may execute arbitrary code as root.
Reboot required? NO
Workarounds? YES
Protected by FPM? NO
Protected by SED? YES
DETAILED INFORMATION
I. DESCRIPTION
There is a buffer overflow vulnerability in the calendar daemon
library libcsa.a. A remote attacker can exploit this
vulnerability when the rpc.cmsd calendar daemon is enabled in
/etc/inetd.conf.
The successful exploitation of this vulnerability allows a remote
attacker to execute arbitrary code as the root user.
The following libraries and executables are vulnerable:
/usr/dt/bin/rpc.cmsd
/usr/dt/lib/libcsa.a
II. PLATFORM VULNERABILITY ASSESSMENT
Note: To use the following commands on VIOS you must first
execute:
oem_setup_env
To determine if your system is vulnerable, execute the following
command:
lslpp -L X11.Dt.lib X11.Dt.rte
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
------------------------------------------------
all earlier levels are vulnerable
X11.Dt.rte 5.3.7.0 5.3.7.3
X11.Dt.lib 5.3.7.0 5.3.7.2
X11.Dt.rte 5.3.8.0 5.3.8.1
X11.Dt.lib 5.3.8.0 5.3.8.0
X11.Dt.rte 5.3.9.0 5.3.9.0
X11.Dt.lib 5.3.9.0 5.3.9.0
X11.Dt.rte 5.3.10.0 5.3.10.0
X11.Dt.lib 5.3.9.0 5.3.9.0
X11.Dt.rte 6.1.0.0 6.1.0.3
X11.Dt.lib 6.1.0.0 6.1.0.2
X11.Dt.rte 6.1.1.0 6.1.1.1
X11.Dt.lib 6.1.1.0 6.1.1.0
X11.Dt.rte 6.1.2.0 6.1.2.1
X11.Dt.lib 6.1.2.0 6.1.2.1
X11.Dt.rte 6.1.3.0 6.1.3.1
X11.Dt.lib 6.1.3.0 6.1.3.1
III. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
---------------------------------------------------
5.3.0 IZ62672 interm fix only
5.3.7 IZ61628 11/11/09 (sp10)
5.3.8 IZ62237 11/11/09 (sp8)
5.3.9 IZ61717 11/11/09 (sp5)
5.3.10 IZ62123 11/11/09 (sp2)
6.1.0 IZ62569 12/16/09 (sp11)
6.1.1 IZ62570 12/16/09 (sp7)
6.1.2 IZ62571 12/16/09 (sp6)
6.1.3 IZ62572 12/16/09 (sp3)
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IZ62672
http://www.ibm.com/support/docview.wss?uid=isg1IZ61628
http://www.ibm.com/support/docview.wss?uid=isg1IZ62237
http://www.ibm.com/support/docview.wss?uid=isg1IZ61717
http://www.ibm.com/support/docview.wss?uid=isg1IZ62123
http://www.ibm.com/support/docview.wss?uid=isg1IZ62569
http://www.ibm.com/support/docview.wss?uid=isg1IZ62570
http://www.ibm.com/support/docview.wss?uid=isg1IZ62571
http://www.ibm.com/support/docview.wss?uid=isg1IZ62572
By subscribing, you will receive periodic email alerting you
to the status of the APAR, and a link to download the fix once
it becomes available.
B. FIXES
Fixes are now available. The fixes can be downloaded from:
ftp://aix.software.ibm.com/aix/efixes/security/cmsd_fix.tar
http://aix.software.ibm.com/aix/efixes/security/cmsd_fix.tar
The links above are to a tar file containing this signed
advisory, fix packages, and PGP signatures for each package.
AIX Level VIOS Level Interim Fix (*.Z)
-------------------------------------------------------------------
5.3.0 TL6 1.4 IZ62672_06.091004.epkg.Z
5.3.7 1.5.0, 1.5.1 IZ61628_07.091003.epkg.Z
5.3.8 1.5.2 IZ62237_08.091003.epkg.Z
5.3.9 IZ61717_09.091003.epkg.Z
5.3.10 IZ62123_10.091003.epkg.Z
6.1.0 IZ62569_00.091003.epkg.Z
6.1.1 IZ62570_01.091003.epkg.Z
6.1.2 2.1.0 IZ62571_02.091003.epkg.Z
6.1.3 2.1.1 IZ62572_03.091003.epkg.Z
To extract the fixes from the tar file:
tar xvf cmsd_fix.tar
cd cmsd_fix
Verify you have retrieved the fixes intact:
The checksums below were generated using the "csum -h SHA1"
(sha1sum) commands and are as follows:
csum -h SHA1 (sha1sum) filename
------------------------------------------------------------------
be8a1acdcb4f09cb62da9d42ea04c3feb9002559 IZ61628_07.091003.epkg.Z
3777d7ca7e9d8d5a74d3364c55bce9f4d4550527 IZ61717_09.091003.epkg.Z
8bf77f5a19cdf757560cd2add98fb01b51539dca IZ62123_10.091003.epkg.Z
1bc742596171d1cbfa3d48ddcf1111936d9feded IZ62237_08.091003.epkg.Z
7fca0ba4d5b43f0896acdffea0a5b427bbef451b IZ62569_00.091003.epkg.Z
943641406c4f1b8bb50cd3a7f459352acb26a4ac IZ62570_01.091003.epkg.Z
a9582999d68bb7aac9af2f64e80a8282be9bdef3 IZ62571_02.091003.epkg.Z
fb2dea536f6e5050f40da336ac4f64f835d74fe7 IZ62572_03.091003.epkg.Z
8588b683a5dc1c5796317e0be77b065fea7dc14d IZ62672_06.091004.epkg.Z
To verify the sums, use the text of this advisory as input to
csum or sha1sum. For example:
csum -h SHA1 -i Advisory.asc
sha1sum -c Advisory.asc
These sums should match exactly. The PGP signatures in the tar
file and on this advisory can also be used to verify the
integrity of the fixes. If the sums or signatures cannot be
confirmed, contact IBM AIX Security and describe the
discrepancy at the following address:
security-alert@austin.ibm.com
C. INTERIM FIX INSTALLATION
IMPORTANT: If possible, it is recommended that a mksysb backup
of the system be created. Verify it is both bootable and
readable before proceeding.
Interim fixes have had limited functional and regression
testing but not the full regression testing that takes place
for Service Packs; thus, IBM does not warrant the fully
correct functionality of an interim fix.
Interim fix management documentation can be found at:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
To preview an interim fix installation:
emgr -e ipkg_name -p # where ipkg_name is the name of the
# interim fix package being previewed.
To install an interim fix package:
emgr -e ipkg_name -X # where ipkg_name is the name of the
# interim fix package being installed.
IV. WORKAROUND
Remove the entry for rpc.cmsd from /etc/inetd.conf and
refresh inetd so that inetd will no longer run the program. This
can be done by running the following command:
chsubserver -r inetd -C /etc/inetd.conf -d -v 'cmsd' -p 'udp'
Any remaining instances of rpc.cmsd should be killed with
the following command:
ps -efl|grep [r]pc.cmsd|awk '{x = "kill " $4}{system(x)}'
NOTE: Removing rpc.cmsd from /etc/inetd.conf will disable some
functionality for all users.
V. OBTAINING FIXES
AIX security fixes can be downloaded from:
http://aix.software.ibm.com/aix/efixes/security
or
ftp://aix.software.ibm.com/aix/efixes/security
AIX fixes can be downloaded from:
http://www.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix
NOTE: Affected customers are urged to upgrade to the latest
applicable Technology Level and Service Pack.
VI. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
please visit:
http://www.ibm.com/systems/support
and click on the "My notifications" link.
To view previously issued advisories, please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd
Comments regarding the content of this announcement can be
directed to:
security-alert@austin.ibm.com
To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:
A. Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt
B. Download the key from a PGP Public Key Server. The key ID is:
0xADA6EB4D
Please contact your local IBM AIX support center for any
assistance.
eServer is a trademark of International Business Machines
Corporation. IBM, AIX and pSeries are registered trademarks of
International Business Machines Corporation. All other trademarks
are property of their respective holders.
VII. ACKNOWLEDGMENTS
This vulnerability was reported by Rodrigo Rubira Branco and
iDefense Labs.
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